AutoCodes – Toyota – P2122 Toyota

P2122 Toyota Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

Quick Answer

The Accelerator Pedal Position (APP) sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2122 Toyota indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low.
Common causes: Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 26,746

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2122 Toyota Description

The Accelerator Pedal Position (APP) sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type sensor and uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the Engine Control Module (ECM), varies between 0.5 V and 4.75 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal position sensor itself.
The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2 and controls the throttle actuator according to these signals.
When either the output voltage of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is more than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a Diagnostic Trouble Code (DTC).

OBDII Code P2122 Toyota - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low - AutoCodes.com — P2122 Toyota Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

What does this mean?

What are the Possible Causes of the DTC P2122 Toyota?

Faulty Accelerator Pedal Position (APP) Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2122 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2122 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2122 Toyota code?

Need more information on how to fix the P2122 Toyota code? Get Access to Factory Service Manuals

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Get the P2122 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

P2122 2006 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2007 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2008 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2009 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2010 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2011 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2001 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2002 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2003 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2004 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2005 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2006 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2007 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2013 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2014 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2015 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2016 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2017 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
P2122 2018 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2122 Toyota Code

1. What are the common symptoms of OBDII code P2122 in a Toyota?

- Common symptoms include reduced engine power, hesitation or surging while driving, and the vehicle going into limp mode.

2. What can cause the Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low code P2122 in a Toyota?

- Possible causes include a faulty throttle pedal position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

3. How can I diagnose the root cause of OBDII code P2122 in my Toyota?

- Diagnosis typically involves checking the throttle pedal sensor for proper operation, inspecting the sensor circuit for damage, and using a scan tool to monitor sensor readings.

4. Can I drive my Toyota with the P2122 code present?

- It's not recommended to drive your vehicle with the P2122 code as it can lead to unsafe driving conditions and potential further damage to the engine.

5. How should I repair OBDII code P2122 in my Toyota?

- Repair may involve replacing the throttle pedal position sensor, repairing damaged wiring or connectors, or reprogramming the engine control module.

6. Will resetting the OBDII code P2122 clear the issue in my Toyota?

- Resetting the code may temporarily turn off the check engine light, but it won't fix the underlying issue causing the P2122 code to appear.

7. Can a DIY enthusiast fix OBDII code P2122 in a Toyota?

- Depending on the root cause, DIY enthusiasts with automotive repair experience may be able to fix the issue by following proper diagnostic procedures and replacing faulty components.

8. Is it safe to continue driving if the P2122 code comes and goes intermittently?

- It's best to address the issue promptly even if the code appears intermittently to prevent potential safety hazards and further damage to the vehicle.

9. How much does it typically cost to repair OBDII code P2122 in a Toyota at a professional service center?

- Repair costs can vary depending on the exact cause of the code, but expect to pay for diagnostic time, parts, and labor, which can range from a few hundred to over a thousand dollars.

10. Can a temporary fix be applied to clear the P2122 code in an emergency situation?

- While temporary fixes like clearing the code may help in emergency situations, it's crucial to address the root cause promptly to prevent recurring issues with the throttle pedal sensor.